Binary conversions in the Google search bar.

From Matt Cutts' blog:

   

Some examples of conversions that can be performed in the Google search bar.

One of Google’s goals is that you should be able to throw just about anything into a search box (package tracking numbers, airline flight numbers, etc.) and Google will try to do something reasonable, such as return the status of a flight. Recently I was trying to reverse engineer a USB protocol and needed to convert some numbers between base 16 (hexadecimal) and base 10 (decimal). On a hunch, I threw the conversion into a Google search box. Sure enough, it worked fine.

http://www.mattcutts.com/blog/easy-tip-to-convert-hex-to-decimal/